<?php

if (! defined('BASEPATH'))
    exit('No direct script access allowed');

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package CodeIgniter
 * @author ExpressionEngine Dev Team
 * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license http://codeigniter.com/user_guide/license.html
 * @link http://codeigniter.com
 * @since Version 1.0
 * @filesource
 *
 */
    
// ------------------------------------------------------------------------

/**
 * CodeIgniter Config Class
 *
 * This class contains functions that enable config files to be managed
 *
 * @package CodeIgniter
 * @subpackage Libraries
 * @category Libraries
 * @author ExpressionEngine Dev Team
 * @link http://codeigniter.com/user_guide/libraries/config.html
 */
class CI_Config
{

    /**
     * List of all loaded config values
     *
     * @var array
     */
    var $config = array();

    /**
     * List of all loaded config files
     *
     * @var array
     */
    var $is_loaded = array();

    /**
     * List of paths to search when trying to load a config file
     *
     * @var array
     */
    var $_config_paths = array(
            APPPATH
    );

    /**
     * Constructor
     *
     * Sets the $config data from the primary config.php file as a class
     * variable
     *
     * @access public
     * @param
     *            string the config file name
     * @param
     *            boolean if configuration values should be loaded into their
     *            own section
     * @param
     *            boolean true if errors should just return false, false if an
     *            error message should be displayed
     * @return boolean if the file was successfully loaded or not
     */
    function __construct ()
    {
        $this->config = & get_config();
        log_message('debug', "Config Class Initialized");
        
        // Set the base_url automatically if none was provided
        if ($this->config['base_url'] == '') {
            if (isset($_SERVER['HTTP_HOST'])) {
                $base_url = isset($_SERVER['HTTPS']) &&
                         strtolower($_SERVER['HTTPS']) !== 'off' ? 'https' : 'http';
                $base_url .= '://' . $_SERVER['HTTP_HOST'];
                $base_url .= str_replace(basename($_SERVER['SCRIPT_NAME']), '', 
                        $_SERVER['SCRIPT_NAME']);
            } 

            else {
                $base_url = 'http://localhost/';
            }
            
            $this->set_item('base_url', $base_url);
        }
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Load Config File
     *
     * @access public
     * @param
     *            string the config file name
     * @param
     *            boolean if configuration values should be loaded into their
     *            own section
     * @param
     *            boolean true if errors should just return false, false if an
     *            error message should be displayed
     * @return boolean the file was loaded correctly
     */
    function load ($file = '', $use_sections = FALSE, $fail_gracefully = FALSE)
    {
        $file = ($file == '') ? 'config' : str_replace('.php', '', $file);
        $found = FALSE;
        $loaded = FALSE;
        
        $check_locations = defined('ENVIRONMENT') ? array(
                ENVIRONMENT . '/' . $file,
                $file
        ) : array(
                $file
        );
        
        foreach ($this->_config_paths as $path) {
            foreach ($check_locations as $location) {
                $file_path = $path . 'config/' . $location . '.php';
                
                if (in_array($file_path, $this->is_loaded, TRUE)) {
                    $loaded = TRUE;
                    continue 2;
                }
                
                if (file_exists($file_path)) {
                    $found = TRUE;
                    break;
                }
            }
            
            if ($found === FALSE) {
                continue;
            }
            
            include ($file_path);
            
            if (! isset($config) or ! is_array($config)) {
                if ($fail_gracefully === TRUE) {
                    return FALSE;
                }
                show_error(
                        'Your ' . $file_path .
                                 ' file does not appear to contain a valid configuration array.');
            }
            
            if ($use_sections === TRUE) {
                if (isset($this->config[$file])) {
                    $this->config[$file] = array_merge($this->config[$file], 
                            $config);
                } else {
                    $this->config[$file] = $config;
                }
            } else {
                $this->config = array_merge($this->config, $config);
            }
            
            $this->is_loaded[] = $file_path;
            unset($config);
            
            $loaded = TRUE;
            log_message('debug', 'Config file loaded: ' . $file_path);
            break;
        }
        
        if ($loaded === FALSE) {
            if ($fail_gracefully === TRUE) {
                return FALSE;
            }
            show_error('The configuration file ' . $file .
                     '.php does not exist.');
        }
        
        return TRUE;
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Fetch a config file item
     *
     *
     * @access public
     * @param
     *            string the config item name
     * @param
     *            string the index name
     * @param
     *            bool
     * @return string
     */
    function item ($item, $index = '')
    {
        if ($index == '') {
            if (! isset($this->config[$item])) {
                return FALSE;
            }
            
            $pref = $this->config[$item];
        } else {
            if (! isset($this->config[$index])) {
                return FALSE;
            }
            
            if (! isset($this->config[$index][$item])) {
                return FALSE;
            }
            
            $pref = $this->config[$index][$item];
        }
        
        return $pref;
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Fetch a config file item - adds slash after item (if item is not empty)
     *
     * @access public
     * @param
     *            string the config item name
     * @param
     *            bool
     * @return string
     */
    function slash_item ($item)
    {
        if (! isset($this->config[$item])) {
            return FALSE;
        }
        if (trim($this->config[$item]) == '') {
            return '';
        }
        
        return rtrim($this->config[$item], '/') . '/';
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Site URL
     * Returns base_url .
     * index_page [. uri_string]
     *
     * @access public
     * @param
     *            string the URI string
     * @return string
     */
    function site_url ($uri = '')
    {
        if ($uri == '') {
            return $this->slash_item('base_url') . $this->item('index_page');
        }
        
        if ($this->item('enable_query_strings') == FALSE) {
            $suffix = ($this->item('url_suffix') == FALSE) ? '' : $this->item(
                    'url_suffix');
            return $this->slash_item('base_url') .
                     $this->slash_item('index_page') . $this->_uri_string($uri) .
                     $suffix;
        } else {
            return $this->slash_item('base_url') . $this->item('index_page') .
                     '?' . $this->_uri_string($uri);
        }
    }
    
    // -------------------------------------------------------------
    
    /**
     * Base URL
     * Returns base_url [.
     * uri_string]
     *
     * @access public
     * @param string $uri            
     * @return string
     */
    function base_url ($uri = '')
    {
        return $this->slash_item('base_url') .
                 ltrim($this->_uri_string($uri), '/');
    }
    
    // -------------------------------------------------------------
    
    /**
     * Build URI string for use in Config::site_url() and Config::base_url()
     *
     * @access protected
     * @param
     *            $uri
     * @return string
     */
    protected function _uri_string ($uri)
    {
        if ($this->item('enable_query_strings') == FALSE) {
            if (is_array($uri)) {
                $uri = implode('/', $uri);
            }
            $uri = trim($uri, '/');
        } else {
            if (is_array($uri)) {
                $i = 0;
                $str = '';
                foreach ($uri as $key => $val) {
                    $prefix = ($i == 0) ? '' : '&';
                    $str .= $prefix . $key . '=' . $val;
                    $i ++;
                }
                $uri = $str;
            }
        }
        return $uri;
    }
    
    // --------------------------------------------------------------------
    
    /**
     * System URL
     *
     * @access public
     * @return string
     */
    function system_url ()
    {
        $x = explode("/", preg_replace("|/*(.+?)/*$|", "\\1", BASEPATH));
        return $this->slash_item('base_url') . end($x) . '/';
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Set a config file item
     *
     * @access public
     * @param
     *            string the config item key
     * @param
     *            string the config item value
     * @return void
     */
    function set_item ($item, $value)
    {
        $this->config[$item] = $value;
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Assign to Config
     *
     * This function is called by the front controller (CodeIgniter.php)
     * after the Config class is instantiated. It permits config items
     * to be assigned or overriden by variables contained in the index.php file
     *
     * @access private
     * @param
     *            array
     * @return void
     */
    function _assign_to_config ($items = array())
    {
        if (is_array($items)) {
            foreach ($items as $key => $val) {
                $this->set_item($key, $val);
            }
        }
    }
}

// END CI_Config class

/* End of file Config.php */
/* Location: ./system/core/Config.php */
